UCL  IRIS
Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Frequency-dependent electrical stimulation of the visual cortex.
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Kanai R, Chaieb L, Antal A, Walsh VP, W
  • Publication date:
    2008
  • Pagination:
    1839, 1843
  • Journal:
    Current Biology
  • Volume:
    18
  • Issue:
    23
  • Print ISSN:
    0960-9822
Abstract
Non-invasive cortical stimulation techniques such as transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS) have proved to be powerful tools to establish causal relationships between brain regions and their functions. In the present study, we demonstrate that a new technique called transcranial alternating current stimulation (tACS) can interact with ongoing rhythmic activities in the visual cortex in a frequency specific fashion and induce visual experiences (phosphenes). We delivered an oscillatory current over the occipital cortex with tACS. In order to observe interactions with ongoing cortical rhythms, we compared the effects of delivering tACS under light and dark conditions. Stimulation over occipital cortex induced perception of continuously flickering light most effectively when the beta frequency range was applied in an illuminated room, whereas the most effective stimulation frequency shifted to the alpha frequency range when tested in darkness. Stimulation with theta or gamma frequencies did not produce any visual phenomena. The shift of the effective stimulation frequency indicates that the frequency dependency is caused by interactions with ongoing oscillatory activity in the cortex stimulated. Our results suggest that tACS can be used as a non-invasive tool to establish causal link between rhythmic cortical activities and their functions.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Author
Institute of Cognitive Neuroscience
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by